JPH02262Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for cooling rollers in a rotary printing press in order to prevent the temperature of ink heated by friction between the rollers from rising.

A rotary printing press is equipped with a large group of rollers, such as swing rollers and kneading rollers, between an ink pot that stores printing ink and a plate cylinder that is equipped with a printing plate, and the ink flows between these rollers. The ink is kneaded during the transfer, is evened out in the axial and circumferential directions of the rollers, and is then supplied to the printing plate by the inking rollers, thus passing through the contact point between the rollers, commonly called the nip. However, the nip pressure between the rollers is applied to the transferred ink, which causes friction and generates heat. This rise in temperature causes the viscosity of the ink to change, which changes the transferability and way the ink collapses, resulting in a problem in that the print density changes significantly from the start to the end of printing.

Conventionally, in order to keep the ink temperature constant, a liquid such as cooling water is supplied from one end of the roller into the roller through a rotary joint to cool the roller, and the cooled liquid is then supplied from the same supply end. A roller cooling device with discharge is used.

Conventionally, this type of roller cooling device has been generally used because it is efficient to supply liquid by inserting a pipe connected to the rotary joint from one end of the roller in the axial direction of the hollow interior. However, in conventional pipes, because the insertion end of the pipe is not supported, the pipe may break due to fatigue, or even if it does not break, the rotation of the rollers may become unbalanced due to curvature.

The present invention was developed in view of the above points, and includes an end shaft equipped with a pipe support that protrudes into the roller body at both ends of the roller body, and cooling is carried out on the axis of one of the end shafts. A water circulation hole is drilled, and the tip of the extension pipe whose base end is connected to the pipe holder at the tip of the extension pipe is supported by the pipe support section of the other end shaft, and the cooling liquid is inserted through the cooling water circulation hole. The tip of the short and small pipe on the supply section side is removably pivoted on the pipe receiver, and both pipe supports are provided with communication ports that communicate the cooling water return hole and the tip of the extension pipe within the roller body. The present invention provides a roller cooling device for a rotary printing press that improves the durability of a liquid supply pipe and facilitates maintenance of the device. Embodiments of the present invention will be described in detail below with reference to the drawings.

This embodiment shows an example in which the present invention is applied to a swinging roller of a rotary printing press, and FIG. 1 is a sectional view of the swinging roller in which the invention is implemented, and FIG. 2 is a sectional view along AA of FIG. 1.
FIG. 3 is a BB sectional view of FIG. 1. In the figure, the body of the swinging roller 1 is integrally formed with a hollow roller body 2 and end plates 3 and 4 fitted to both ends of the roller body. 2
End shafts 9 and 10 with flanges, which have pipe support portions 9a and 10a projecting inward and are pivotally supported by the frames 5 and 6 on both sides via bushes 7 and 8, are fitted and fixed with bolts 11 and 12. There is. this house,
A cooling water return hole 13 is bored in the shaft center of one end shaft 9 from the shaft end side.
3 communicates with the inside of the roller through a pair of communication holes 14 formed in the insertion portion of the end shaft 9. Further, a gunmetal bush 15 serving as a pipe holder is fitted into the insertion end of the end shaft 9, and the knock pin 1 is inserted into the end shaft 9.
It is fixed at 6. A conventionally well-known rotary joint 17 is fixed to the frame 5 side as a liquid supply section that can supply fluid to the rotating body, and this has a supply port 18 and a discharge port fixed to the frame 5 side. 19 are provided in communication with the internal supply passage and discharge passage, respectively.

A short pipe 20 held by the rotary joint 17 is inserted into the cooling water return hole 13, and its insertion end is rotatably engaged with the bush 15. The supply port 18 is communicated with the supply port 18 through a supply passage therein. Furthermore, a discharge passage 21 is formed between the cooling water return hole 13 and the short pipe 20.
The discharge port 19 communicates with the inside of the roller via a discharge passage in the rotary joint 17, a discharge passage 21, and a communication hole 14.

On the other hand, in the insertion portion of the end shaft 10 at the other end of the roller, a communication hole 22 penetrating in the diametrical direction and a pipe holding hole 23 penetrating the shaft core from the end surface toward the communication hole 22 are bored. The pipe holding hole 23
A pipe 24 is inserted with its tip facing the communication hole 22 and fixed with a set screw 25. Reference numeral 26 denotes a partition plate fitted to the inner circumferential surface of the trunk body 2 close to the insertion end of the end shaft 9, and a through hole 27 with chamfered ends is bored in the shaft core. After the extending pipe 24 is inserted into the through hole 27, its other end is removably pivoted to the bush 15, and is joined and communicated with the short pipe 20. Note that the partition plate 26 is provided with a plurality of communication holes 28 for communicating the inside of the rollers before and after the partition plate 26 .

The operation of the roller cooling device configured as above will be explained. The swing roller 1 rotates within an ink transfer path of an inking device (not shown), and ink is transferred between the swing roller 1 and an opposing roller.
The cooling water shown as an example of the cooling liquid is supplied from the direction of arrow C to the supply port 18 of the rotary joint 17 that is stationary, and the supplied cooling water passes through the supply passage inside the rotary joint 17 and is brought to a stationary state. into the short and small pipe 20. A pipe 2 communicating with the short pipe 20 inside the bush 15
4 and is discharged into the roller body 2 from its tip opening through the communication hole 22. The discharged cooling water fills the entire interior of the roller body 2 that communicates with the through hole 28 of the partition plate 26, and the excess cooling water flows into the discharge passage 21 from the communication hole 14 of the end shaft 9 and is discharged from the rotary shaft. The liquid is discharged from the discharge port 19 in the direction of arrow D through the discharge passage in the inlet 17. By circulating the cooling water through such a path, the shaking roller 1 is cooled, and the ink being transferred is cooled to maintain a constant temperature.

In the roller cooling device that operates in this manner, the long pipe 24, which is the main part of the cooling water supply pipe, is supported by the end shafts 9 and 10 on both sides and is integrally fixed to the roller body 2, and the rotary joint is fixed to the roller body 2. The pipe directly connected to the inlet 17 is only a short pipe 20, and one end is supported by the bush 15, so even if the swing roller rotates, the pipe 20
4, 20 will not swing, and in case of short and small pipe 2
Even if there is a slight deflection at zero, it will not damage the pipe holding portion of the rotary joint 17 because it is short.

When the bush 15 rotatably engaged with the short pipe 20 wears out after long-term use and needs to be replaced, the bolt 1 that fixes the end shaft 9 on one side
1 and pull out the end shaft 9 from the roller body 2, the end shaft 9 can be removed while leaving the pipe 24 inside the roller.
The pipe 24 is easily engaged with the bushing 15 by loosening the shaft, replacing the bushing 15, and inserting the end shaft 9. By simply removing the end shaft 9 on one side, the bush 1
5 can be easily replaced.

As is clear from the above description, according to the present invention, in a roller cooling device for a rotary printing press, an end shaft is provided at both ends of the roller body with a pipe support portion protruding into the roller body. A cooling water circulation hole is bored on the axis of the end shaft, and the tip of the extension pipe whose base end is connected to the pipe holder at the tip thereof is supported by the pipe support section of the other end shaft, The tips of the short and small pipes on the cooling liquid supply side that are inserted into the cooling water return holes are removably supported on the pipe receiver, and the tips of the cooling water return holes and the extension pipes are attached to both pipe supports. By providing a communication port for communication within the roller body, most of the pipe that supplies the cooling liquid is fixedly supported on the roller side, and the pipe that is directly connected to the liquid supply section is short in length. Since one end is supported on the roller side, the pipe does not swing even when the roller rotates, so there is no damage to the pipe itself or the holding member of the liquid supply section that holds it, and the durability of the entire device is significantly increased. can be improved. In addition, the short and small pipes and their shaft support can be easily taken out of the roller while leaving the long pipe inside the roller, and since the long pipe can be easily attached and detached from the roller body, it is easy to replace bearings and pipes. Maintenance work is easy and work efficiency is improved.

[Brief explanation of drawings]

1 to 3 show an embodiment of a roller cooling device for a rotary printing press according to the present invention, FIG. 1 is a sectional view of a swinging roller of a rotary printing press in which this is implemented, and FIG. Figure 3 is the AA cross-sectional view of Figure 1.
It is a BB sectional view. 1... Swinging roller, 2... Roller body, 9,1
0...End shaft, 15...Button, 9a, 10a...
... Pipe support part, 13 ... Cooling water return hole, 14,
22...Communication hole, 17...Rotary joint,
20... Short and small pipe, 24... Pipe.

Claims (1)

[Scope of utility model registration request] End shafts 9 and 10 fixed to both ends of the roller body 2
Pipe supports 9a and 10a are respectively provided that protrude into the roller body 2, a cooling water return hole 13 is provided on the axis of one end shaft 9, and a pipe receiver 15 is provided at the tip of the end shaft 9. The proximal end of the extension pipe 24 is connected to this pipe receiver 15 and its tip is supported by the pipe support portion of the other end shaft 10, and the short and small pipe 20 held in the cooling liquid supply section 17 is cooled. It is inserted into the water return hole 13 and its tip is removably supported by the pipe receiver 15, and both the pipe supports 9a and 10a include:
A roller cooling device for a rotary printing press, in which communication ports 14 and 22 are provided so that the cooling water return hole 13 and the tip of the extension pipe 24 communicate with the inside of the roller body 2.